To provide an output buffer circuit that suppresses increases in the area, volume and number of components of output buffers and improves drive capability.

In an output buffer circuit 1 having a first input path 4a for transmitting a first drive signal LIN, a second input path 4b for transmitting a second drive signal RIN, a first output buffer 6a corresponding to the first input path 4a, and a second output buffer 6b corresponding to the second input path 4b, input path switching means 8 electrically connects the first input path 4a to the first output buffer 6a and second output buffer 6b in a monaural mode out of stereo and monaural modes, and output path switching means 10 electrically connects the first output buffer 6a and second output buffer 6b to a first load 2a corresponding to the first input path 4a and first output buffer 6a.